Java Code Examples for org.python.util.PythonInterpreter#initialize()

private void init()
{
    // System.out.println("Initializing on " + Thread.currentThread().getName());
    final Properties pre_props = System.getProperties();
    final Properties props = new Properties();

    String home = PythonInterpreter.class
                                   .getProtectionDomain().getCodeSource().getLocation().toString();
    System.out.println("Jython home: " + home);
    assertThat(home, not(nullValue()));

    if (home.contains(".jar"))
        System.out.println("Jython provided as JAR");
    home = home.replace("file:", "");

    props.setProperty("python.home", home);
    // props.setProperty("python.executable", "None");
    props.setProperty(RegistryKey.PYTHON_CACHEDIR_SKIP, "true");
    props.setProperty("python.import.site", "false");
    // props.setProperty("python.console.encoding", "UTF-8");

    props.setProperty("python.path", "/tmp/always");
    // props.setProperty("python.verbose", "debug");
    // Options.verbose = Py.DEBUG;
    PythonInterpreter.initialize(pre_props, props, new String[0]);
}
 

private void initPython(String executablePath, Collection<String> pythonPath, String[] argv)
/*     */   {
/* 160 */     Properties props = new Properties();
/*     */ 
/* 163 */     StringBuilder sb = new StringBuilder();
/* 164 */     sb.append(System.getProperty("java.class.path"));
/* 165 */     for (String p : pythonPath) {
/* 166 */       sb.append(":").append(p);
/*     */     }
/* 168 */     props.setProperty("python.path", sb.toString());
/*     */ 
/* 173 */     props.setProperty("python.verbose", "error");
/*     */ 
/* 176 */     props.setProperty("python.executable", executablePath);
/*     */ 
/* 178 */     PythonInterpreter.initialize(System.getProperties(), props, argv);

/*     */     
/* 180 */     //String frameworkDir = System.getProperty("java.ext.dirs");
/* 181 */     //File monkeyRunnerJar = new File(frameworkDir, "monkeyrunner.jar");
/* 182 */     //if (monkeyRunnerJar.canRead())
/* 183 */      // PySystemState.packageManager.addJar(monkeyRunnerJar.getAbsolutePath(), false);
/*     */   }
 

/** Perform static, one-time initialization */
private static boolean init()
{
    try
    {
        final Properties pre_props = System.getProperties();
        final Properties props = new Properties();

        // Jython 2.7(b3) needed these to set sys.prefix and sys.executable.
        // Locate the jython plugin for 'home' to allow use of /Lib in there
        // final String home = null; // getPluginPath("org.python.jython", "/");

        // If left undefined, initialization of Lib/site.py fails with
        // posixpath.py", line 394, in normpath AttributeError:
        // 'NoneType' object has no attribute 'startswith'
        // props.setProperty("python.home", home);
        // props.setProperty("python.executable", "None");

        // Disable cachedir to avoid creation of cachedir folder.
        // See http://www.jython.org/jythonbook/en/1.0/ModulesPackages.html#java-package-scanning
        // and http://wiki.python.org/jython/PackageScanning
        props.setProperty(RegistryKey.PYTHON_CACHEDIR_SKIP, "true");

        // By default, Jython compiler creates bytecode files xxx$py.class
        // adjacent to the *.py source file.
        // They are owned by the current user, which typically results in
        // problems for other users, who can either not read them, or not
        // write updates after *.py changes.
        // There is no way to have them be created in a different, per-user directory.
        // C Python honors an environment variable PYTHONDONTWRITEBYTECODE=true to
        // disable its bytecode files, but Jython only checks that in its command line launcher.
        // Use the same environment variable in case it's defined,
        // and default to disabled bytecode, i.e. the safe alternative.
        if (System.getenv("PYTHONDONTWRITEBYTECODE") == null)
            Options.dont_write_bytecode = true;
        else
            Options.dont_write_bytecode = Boolean.parseBoolean(System.getenv("PYTHONDONTWRITEBYTECODE"));

        // With python.home defined, there is no more
        // "ImportError: Cannot import site module and its dependencies: No module named site"
        // Skipping the site import still results in faster startup
        props.setProperty("python.import.site", "false");

        // Prevent: console: Failed to install '': java.nio.charset.UnsupportedCharsetException: cp0.
        props.setProperty("python.console.encoding", "UTF-8");

        // This will replace entries found on JYTHONPATH
        final String python_path = Preferences.python_path;
        if (! python_path.isEmpty())
            props.setProperty("python.path", python_path);

        // Options: error, warning, message (default), comment, debug
        // props.setProperty("python.verbose", "debug");
        // org.python.core.Options.verbose = Py.DEBUG;

        PythonInterpreter.initialize(pre_props, props, new String[0]);
        final PySystemState state = Py.getSystemState();
        final PyList paths = state.path;

        // Add the examples/connect2j to path.
        // During development, examples are in
        // "file:/some/path/phoebus/applications/display/model/target/classes/examples"
        final String examples = ModelPlugin.class.getResource("/examples").toString();
        if (examples.startsWith("file:"))
            paths.add(examples.substring(5) + "/connect2j");
        // In the compiled version, examples are in
        // "jar:file:/some/path/display-model-0.0.1.jar!/examples"
        else if (examples.startsWith("jar:file:"))
            paths.add(examples.substring(9).replace("jar!/", "jar/") + "/connect2j");
        else
            logger.log(Level.WARNING, "Cannot locate examples/connect2j from " + examples);

        final PyVersionInfo version = PySystemState.version_info;
        logger.log(Level.INFO, "Initial Paths for Jython " + version.major + "." + version.minor + "." + version.micro + ": " + paths);

        // Scripts would sometimes fail in "from ... import ..." with this error:
        //
        // File "..jython-standalone-2.7.1.jar/Lib/warnings.py", line 226, in warn
        // IndexError: index out of range: 0
        //
        // That version of Lib/warnings.py:226 tries to read sys.argv[0],
        // so setting sys.argv[0] avoids the crash.
        // Since state is shared by all scripts in a display,
        // set it to a generic "DisplayBuilderScript"
        state.argv.clear();
        state.argv.add("DisplayBuilderScript");

        return true;
    }
    catch (Exception ex)
    {
        logger.log(Level.SEVERE, "Once this worked OK, but now the Jython initialization failed. Don't you hate computers?", ex);
    }
    return false;
}
 

/** Perform static, one-time initialization */
private static boolean init()
{
    final List<String> paths = new ArrayList<>();
    try
    {
        final Properties pre_props = System.getProperties();
        final Properties props = new Properties();

        // Compare jython setup with
        // org.csstudio.display.builder.runtime.script.internal.JythonScriptSupport

        // Disable cachedir to avoid creation of cachedir folder.
        // See http://www.jython.org/jythonbook/en/1.0/ModulesPackages.html#java-package-scanning
        // and http://wiki.python.org/jython/PackageScanning
        props.setProperty(RegistryKey.PYTHON_CACHEDIR_SKIP, "true");

        // By default, Jython compiler creates bytecode files xxx$py.class
        // adjacent to the *.py source file.
        // They are owned by the current user, which typically results in
        // problems for other users, who can either not read them, or not
        // write updates after *.py changes.
        Options.dont_write_bytecode = true;

        // With python.home defined, there is no more
        // "ImportError: Cannot import site module and its dependencies: No module named site"
        // Skipping the site import still results in faster startup
        props.setProperty("python.import.site", "false");

        // Prevent: console: Failed to install '': java.nio.charset.UnsupportedCharsetException: cp0.
        props.setProperty("python.console.encoding", "UTF-8");

        // Options: error, warning, message (default), comment, debug
        // props.setProperty("python.verbose", "debug");

        // No need to add numjy,
        // it's found on __pyclasspath__ because it's in the scan-model module

        // Add scan script paths
        for (String pref_path : ScanServerInstance.getScanConfig().getScriptPaths())
        {
            // Resolve built-in examples
            if (pref_path.startsWith(PathStreamTool.EXAMPLES))
            {
                String path = PathStreamTool.patchExamplePath(pref_path);
                final URL url = ScanServerInstance.class.getResource(path);
                if (url == null)
                    throw new Exception("Error in scan script path " + pref_path);
                path = url.toExternalForm();
                // Patch file:/path/to/the_file.jar!/path/within
                if (path.startsWith("file:"))
                    path = path.substring(5);
                path = path.replace(".jar!", ".jar");
                paths.add(path);
            }
            else // Add as-is
                paths.add(pref_path);
        }

        props.setProperty("python.path", paths.stream().collect(Collectors.joining(java.io.File.pathSeparator)));

        PythonInterpreter.initialize(pre_props, props, new String[0]);
        final PySystemState state = Py.getSystemState();
        final PyVersionInfo version = PySystemState.version_info;
        logger.log(Level.INFO, "Initial Paths for Jython " + version.major + "." + version.minor + "." + version.micro + ":");
        for (Object o : state.path)
            logger.log(Level.INFO, " * " + Objects.toString(o));

        // Display Builder Scripts would sometimes fail in "from ... import ..." with this error:
        //
        // File "..jython-standalone-2.7.1.jar/Lib/warnings.py", line 226, in warn
        // IndexError: index out of range: 0
        //
        // That version of Lib/warnings.py:226 tries to read sys.argv[0],
        // so setting sys.argv[0] avoids the crash.
        state.argv.clear();
        state.argv.add("ScanServerScript");
    }
    catch (Exception ex)
    {
        logger.log(Level.SEVERE, "Once this worked OK, but now the Jython initialization failed. Don't you hate computers?", ex);
        return false;
    }
    return true;
}